PDLSCs overexpressing TNFR1 were established by lentivirus infection (Figure 4C), with TNFR1 expression localized on the cell membrane, as indicated by the co-localization of TNFR1-GFP (green) and DID-labeled cell membrane (red) (Figure 4D). Here, TNFRSF1A is linked to lentivirus infection.